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Bashir Ahmmad ARIMA
Bashir Ahmmad ARIMA
Yamagata University, Japan
Sonication-assisted fabrication of metal doped BiFeO3 nanoparticles and investigation of their magnetic properties

We present a simple technique to fabricate multiferroic nanoparticlesfrom the bulk powder materialsby using ultrasonic energy. The bulk ceramic samples, with nominal composition of Bi0.9Gd0.1Fe1–xTixO3and Bi0.7Ba0.3Fe1-xTixO3 (x=0.00-0.25), were synthesized initially by conventional solid state reaction technique. Then, the nanoparticles of the samples were prepared by ultrasonic fragmentation of the bulk power. The particles size of Bi0.9Gd0.1Fe1–xTixO3 was studied as a function of sonication time with TEM imaging and electron diffraction. These confirmed the formation of a large fraction of single-crystalline nanoparticles with a mean size of 12 nm. The synthesized nanoparticles exhibited a significantly improved magnetic behavior compared to their bulk counterparts at room temperature.Also, a large difference between the magnetic properties of nanoparticle and bulk powderwas observed forBi0.7Ba0.3Fe1-xTixO3 sample. The X-ray diffraction patterns demonstrated the presence of significant number of impurity phases in the bulk materials. Interestingly, these secondary phases were removed due to sonication of the bulk powder materials for 60 min.Moreover, X-ray photoelectron spectroscopy showed reduced oxygen vacancies in the nanoparticles compared to the bulk sample. Reduced oxygen vacancies resulted reduced leakage current and improved ferroelectric properties. We believe that the observe improvement of samples purity via the ultrasonic method may be promising to fabricated a wide range of functional nanomaterials. 

Bashir AhmmadArima has completed his PhD from Kagoshima University, Japan. Currently, he is an assistant professor at the Graduate School of Science and Engineering, Yamagata University, Japan. Prior to joining the current institution, he was an assistance professor and researcher at Okayama University and Kyushu University, respectively. He is a recipient of Japanese government scholarship and also JSPS postdoctoral fellowship in Japan. His research interests include nanophotocatalysis, solar-hydrogen,solar cells and magnetic materials. He has published more than 60technical papers in reputed journals and 2 book chapters.He had been the guest editor of the International Journal of Photoenergy in 2014. Presently, he is serving as editorial board member of American Research Journal of Electrical Engineering, International Institute of Engineers and technical committee member of Component Parts and Materials (CPM) ofthe IEICE societyin Japan.
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